<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>浮动与单侧尺寸固定的流体布局</title>
<style>
/*左右,左侧固定,右侧自适应*/
body { font-size: 14px; background-color: #DDF3F7; color: #333; }
a { color: #0082CB; text-decoration: none; }
p { margin: 0; } img { border: 0; }

.mib_body { width: 600px; margin-left: auto; margin-right: auto; -webkit-transition: width .35s; transition: width .35s; }
.mib_x { margin-bottom: 10px; background-color: #fff; }
.mib_list { padding: 20px; overflow: hidden; _zoom: 1; }
.mib_vip { display: inline-block; width: 11px; height: 10px; margin-left: 1px; background: url(); }
/* 左侧固定,用width */
.mib_head_a { width: 56px; float: left; }
/* 下面这个是固定布局写法 */
.mib_feed_fixed { width: 484px; float: right; }
/* 下面这个是流体布局写法 */
.mib_feed_flow { margin-left: 76px; }

.mib_sms { line-height: 22px; padding-bottom: 6px; font-size: 14px; }
.mib_input { width: 70px; padding: 4px; font-size: 100%; }
.mib_btn { width: 70px; padding: 5px; font-size: 100%; }

</style>
</head>

<body>
<div id="mibBody" class="mib_body">
    <div class="mib_x">
        <div class="mib_list">
            <a href="http://t.sina.com.cn/xuruoxuan" class="mib_head_a">
                <img title="徐若瑄VIVIAN" src="../images/53e2e9470001dfd200500050.jpg">
            </a>
            <div class="mib_feed_fixed">
                <p class="mib_sms"><a title="徐若瑄VIVIAN" href="#">徐若瑄VIVIAN<i title="新浪认证" class="mib_vip"></i></a>：一個人的晚餐！茶泡飯！飯、飯、飯… 今日不減肥，先把病治好再說！ 我認真吃完這，燒就會退了吧？！ 開動啦~~~~~~~~~~~~~~~~~~</p>
                <div class="feed_img"><img src="../images/53e2e9b10001948000890120.jpg" height="120"></div>
            </div>
        </div>
    </div>
    <div class="mib_x">
        <div class="mib_list">
            <a href="http://t.sina.com.cn/xuruoxuan" class="mib_head_a">
                <img title="徐若瑄VIVIAN" src="../images/53e2e9470001dfd200500050.jpg">
            </a>
            <div class="mib_feed_flow">
                <p class="mib_sms"><a title="徐若瑄VIVIAN" href="#">徐若瑄VIVIAN<i title="新浪认证" class="mib_vip"></i></a>：一個人的晚餐！茶泡飯！飯、飯、飯… 今日不減肥，先把病治好再說！ 我認真吃完這，燒就會退了吧？！ 開動啦~~~~~~~~~~~~~~~~~~</p>
                <div class="feed_img"><img src="../images/53e2e9b10001948000890120.jpg" height="120"></div>
            </div>	
        </div>
    </div>
    
    <div class="mib_x">
        <div class="mib_list">
            <p class="mib_sms">
            	修改外框的宽度：<input type="number" id="mibInput" step="100" class="mib_input" value="600"> 像素
            </p>
            <button type="button" id="mibBtn" class="mib_btn">确定</button>
        </div>
    </div>
</div>
<script>
var ele_mibBody = document.getElementById("mibBody"),
	ele_mibInput = document.getElementById("mibInput"),
	ele_mibBtn = document.getElementById("mibBtn");

if ( ele_mibBody && ele_mibInput && ele_mibBtn ) {
	ele_mibBtn.onclick = function() {
		var value = ele_mibInput.value;
		if (!/^\d+$/.test(value)) {
			value = 600;
			ele_mibInput.value = value;
		}
		// 改变最外面容器的尺寸
		ele_mibBody.style.width = value + "px";
	};
	
	if (ele_mibInput.type == "number") {
		ele_mibInput.onchange = function() {
			ele_mibBtn.click();
		};
	}
}
</script>
</body>
</html>